Jalan Serian–Tebedu, Federal Route 21, is a major highway in Serian Division, Sarawak, Malaysia. It is a dual lane road that is maintained by PPES Works Sdn. Bhd., a subsidiary of CMS Road. It connects Serian roundabout to Tebedu. Among other major destinations branched out from this route are Riih, Tebakang and Mongkos. It is a major route to West Kalimantan, Indonesia and is frequently used by people from both Malaysia and Indonesia to cross the border. Along this road are many scattered houses, privately owned orchards, churches, primary schools and chapels. It branches out to many small villages such as Kg. Kakai and Kg. Tian. GIATMARA institution of Serian district is also located here.

The Kilometre Zero is located at Tebedu town.

List of interchanges

KmExitInterchangeToRemarks
Serian Serian RoundaboutNorth FT 1 AH150 Pan Borneo Highway FT 1-15 AH150 Jalan Kuching–Serian (Kuching/Samarahan Boundary–Sg. Mamat Bridge) FT 1-16 AH150 Jalan Kuching–Serian (Sg. Mamat Bridge–Serian Roundabout) Siburan Kota Samarahan Kuching East Serian Bypass Taman Pasir FT 1 AH150 Jalan Serian–Sri Aman Simunjan Sri Aman Southeast FT 1 AH150 Jalan Bandar Serian Serian Hospital Serian town centre FT 1 AH150 Jalan Serian–Sri Aman Simunjan Sri Aman4-way roundabout
Serian (old link road)East Q144 Serian-Tebakang Old Link Road Kg. Murud Balai Bomba dan Penyelamat SerianT-junctions
Old Serian-Tebakang RoadEast Q356 Serian-Tebakang-Tebedu-Indonesian Border Old Link Road Kg. TianT-junctions
Serian-Tebedu district border
Baki-RiihNorthwest Q542 Baki-Riih Road Pekan Baki Lama Kg. Riih Mawang Kg. Riih Daso Kg. Rituh Kg. Bantang Kg. Pichin Kg. Tanggak Kg. Tubih Kg. Tubih MawangT-junctions
Muara Mongkos RoadNorthwest Q154 Muara Mongkos Road Kg. Tebakang Dayak Kg. Tebakang Melayu Mongkos Q154-1 Tebakang/Mongkos Junction-Sg. Nyanuh Bridge Q154-2 Sg. Nyanuh Bridge Tebakang Bunan Kg. Bung Padus Kg. Bunan Gega Kg. Bunan Punok Kg. Gahat Mongkos Kg. Mapu Kg. Mapu Tragu Kg. Mentu Pondok Kg. Mentu Mawang Kg. Mentu TapuT-junctions
Tebedu Inland PortTebedu Inland Port
FT 21 0TebeduBandar Mutiara Land Port Tebedu Duty Free Shop Kg. Darul Iman Kg. Tebedu Melayu Kg. Tebedu Bidayuh
Tebedu Checkpoint
Malaysia Sarawak Serian Division Tebedu district border
ASEAN Malaysia-Indonesia Border
Indonesia West Kalimantan Sanggau district border
South Indonesia Indonesia West Kalimantan Entikong Checkpoint Balai Karangan Pontianak